// 博客多语言翻译API服务
const express = require('express');
const router = express.Router();
const { authenticateToken } = require('../middleware/auth');
const Authorization = require('../middleware/authorization');

// 支持的17种语言
const SUPPORTED_LANGUAGES = [
    'zh-CN', 'zh-TW', 'en-US', 'en-GB', 'ja-JP', 'ko-KR', 
    'fr-FR', 'de-DE', 'es-ES', 'es-MX', 'pt-BR', 'pt-PT',
    'ru-RU', 'ar-SA', 'hi-IN', 'th-TH', 'vi-VN'
];

// 获取博客翻译配置
router.get('/blog-translation/config', authenticateToken, async (req, res) => {
    try {
        const defaultConfig = {
            enabled: true,
            autoTranslate: true,
            supportedLanguages: SUPPORTED_LANGUAGES,
            defaultLanguage: 'zh-CN',
            translationProvider: 'google',
            apiKey: '',
            qualityCheck: true,
            protectProperNouns: true,
            protectedNouns: ['ubike', 'iPhone', 'Google', 'Microsoft', 'Apple', 'Samsung']
        };
        
        res.json({
            success: true,
            data: defaultConfig
        });
    } catch (error) {
        console.error('获取博客翻译配置失败:', error);
        res.status(500).json({
            success: false,
            message: '获取博客翻译配置失败'
        });
    }
});

// 更新博客翻译配置
router.put('/blog-translation/config', authenticateToken, Authorization.requireRole(['admin', 'editor']), async (req, res) => {
    try {
        const config = req.body;
        
        // 验证配置
        if (!config.supportedLanguages || !Array.isArray(config.supportedLanguages)) {
            return res.status(400).json({
                success: false,
                message: '支持的语言列表不能为空'
            });
        }
        
        // 确保支持的语言在有效范围内
        const validLanguages = config.supportedLanguages.filter(lang => 
            SUPPORTED_LANGUAGES.includes(lang)
        );
        
        if (validLanguages.length === 0) {
            return res.status(400).json({
                success: false,
                message: '至少需要支持一种语言'
            });
        }
        
        // 这里可以将配置保存到数据库
        // 暂时返回成功响应
        res.json({
            success: true,
            message: '博客翻译配置更新成功',
            data: {
                ...config,
                supportedLanguages: validLanguages
            }
        });
    } catch (error) {
        console.error('更新博客翻译配置失败:', error);
        res.status(500).json({
            success: false,
            message: '更新博客翻译配置失败'
        });
    }
});

// 翻译博客内容
router.post('/blog-translation/translate', authenticateToken, Authorization.requireRole(['admin', 'editor']), async (req, res) => {
    try {
        const { blogId, sourceLanguage, targetLanguages, content } = req.body;
        
        if (!blogId || !sourceLanguage || !targetLanguages || !content) {
            return res.status(400).json({
                success: false,
                message: '缺少必要的参数'
            });
        }
        
        // 验证源语言和目标语言
        if (!SUPPORTED_LANGUAGES.includes(sourceLanguage)) {
            return res.status(400).json({
                success: false,
                message: '不支持的源语言'
            });
        }
        
        const validTargetLanguages = targetLanguages.filter(lang => 
            SUPPORTED_LANGUAGES.includes(lang) && lang !== sourceLanguage
        );
        
        if (validTargetLanguages.length === 0) {
            return res.status(400).json({
                success: false,
                message: '没有有效的目标语言'
            });
        }
        
        // 模拟翻译过程
        const translations = await this.simulateTranslation(content, sourceLanguage, validTargetLanguages);
        
        res.json({
            success: true,
            message: '博客内容翻译完成',
            data: {
                blogId,
                sourceLanguage,
                translations,
                timestamp: new Date().toISOString()
            }
        });
    } catch (error) {
        console.error('翻译博客内容失败:', error);
        res.status(500).json({
            success: false,
            message: '翻译博客内容失败'
        });
    }
});

// 获取博客多语言版本
router.get('/blog-translation/versions/:blogId', authenticateToken, async (req, res) => {
    try {
        const { blogId } = req.params;
        
        // 模拟获取博客的多语言版本
        const versions = await this.getBlogVersions(blogId);
        
        res.json({
            success: true,
            data: {
                blogId,
                versions,
                total: versions.length
            }
        });
    } catch (error) {
        console.error('获取博客多语言版本失败:', error);
        res.status(500).json({
            success: false,
            message: '获取博客多语言版本失败'
        });
    }
});

// 发布博客多语言版本
router.post('/blog-translation/publish', authenticateToken, Authorization.requireRole(['admin', 'editor']), async (req, res) => {
    try {
        const { blogId, language, title, content, metadata } = req.body;
        
        if (!blogId || !language || !title || !content) {
            return res.status(400).json({
                success: false,
                message: '缺少必要的参数'
            });
        }
        
        if (!SUPPORTED_LANGUAGES.includes(language)) {
            return res.status(400).json({
                success: false,
                message: '不支持的语言'
            });
        }
        
        // 模拟发布过程
        const publishedVersion = await this.publishBlogVersion(blogId, language, title, content, metadata);
        
        res.json({
            success: true,
            message: `博客 ${language} 版本发布成功`,
            data: publishedVersion
        });
    } catch (error) {
        console.error('发布博客多语言版本失败:', error);
        res.status(500).json({
            success: false,
            message: '发布博客多语言版本失败'
        });
    }
});

// 批量翻译博客
router.post('/blog-translation/batch-translate', authenticateToken, Authorization.requireRole(['admin', 'editor']), async (req, res) => {
    try {
        const { blogIds, targetLanguages } = req.body;
        
        if (!blogIds || !Array.isArray(blogIds) || blogIds.length === 0) {
            return res.status(400).json({
                success: false,
                message: '博客ID列表不能为空'
            });
        }
        
        if (!targetLanguages || !Array.isArray(targetLanguages) || targetLanguages.length === 0) {
            return res.status(400).json({
                success: false,
                message: '目标语言列表不能为空'
            });
        }
        
        // 验证目标语言
        const validTargetLanguages = targetLanguages.filter(lang => 
            SUPPORTED_LANGUAGES.includes(lang)
        );
        
        if (validTargetLanguages.length === 0) {
            return res.status(400).json({
                success: false,
                message: '没有有效的目标语言'
            });
        }
        
        // 模拟批量翻译过程
        const results = await this.batchTranslateBlogs(blogIds, validTargetLanguages);
        
        res.json({
            success: true,
            message: `批量翻译完成，共处理 ${blogIds.length} 篇博客`,
            data: {
                totalBlogs: blogIds.length,
                totalLanguages: validTargetLanguages.length,
                results,
                timestamp: new Date().toISOString()
            }
        });
    } catch (error) {
        console.error('批量翻译博客失败:', error);
        res.status(500).json({
            success: false,
            message: '批量翻译博客失败'
        });
    }
});

// 模拟翻译功能
BlogTranslationAPI.prototype.simulateTranslation = async function(content, sourceLanguage, targetLanguages) {
    const translations = {};
    
    for (const targetLang of targetLanguages) {
        // 模拟翻译延迟
        await new Promise(resolve => setTimeout(resolve, 100));
        
        // 这里可以集成实际的翻译API（Google Translate、百度翻译等）
        // 目前使用模拟翻译结果
        translations[targetLang] = {
            title: `[${targetLang}] ${this.getSampleTitle(sourceLanguage, targetLang)}`,
            content: this.getSampleContent(content, sourceLanguage, targetLang),
            status: 'translated',
            quality: 'high',
            translatedAt: new Date().toISOString(),
            wordCount: content.length
        };
    }
    
    return translations;
};

// 获取示例标题
BlogTranslationAPI.prototype.getSampleTitle = function(sourceLang, targetLang) {
    const titles = {
        'zh-CN': '博客标题示例',
        'en-US': 'Blog Title Example',
        'ja-JP': 'ブログタイトル例',
        'ko-KR': '블로그 제목 예시',
        'fr-FR': 'Exemple de titre de blog',
        'de-DE': 'Blog-Titel-Beispiel',
        'es-ES': 'Ejemplo de título de blog',
        'ru-RU': 'Пример заголовка блога'
    };
    
    return titles[targetLang] || `Translated Title (${targetLang})`;
};

// 获取示例内容
BlogTranslationAPI.prototype.getSampleContent = function(originalContent, sourceLang, targetLang) {
    // 这里可以集成实际的翻译API
    // 目前返回模拟内容
    return `这是从 ${sourceLang} 翻译到 ${targetLang} 的内容示例。\n\n原始内容：${originalContent.substring(0, 100)}...`;
};

// 获取博客版本
BlogTranslationAPI.prototype.getBlogVersions = async function(blogId) {
    // 模拟从数据库获取博客版本
    return [
        {
            language: 'zh-CN',
            title: '博客标题',
            status: 'published',
            publishedAt: new Date().toISOString(),
            author: '系统管理员'
        },
        {
            language: 'en-US',
            title: 'Blog Title',
            status: 'translated',
            translatedAt: new Date().toISOString(),
            translator: '自动翻译'
        }
    ];
};

// 发布博客版本
BlogTranslationAPI.prototype.publishBlogVersion = async function(blogId, language, title, content, metadata) {
    // 模拟发布过程
    return {
        blogId,
        language,
        title,
        content: content.substring(0, 200) + '...',
        status: 'published',
        publishedAt: new Date().toISOString(),
        url: `/blog/${blogId}/${language}`,
        metadata: metadata || {}
    };
};

// 批量翻译博客
BlogTranslationAPI.prototype.batchTranslateBlogs = async function(blogIds, targetLanguages) {
    const results = [];
    
    for (const blogId of blogIds) {
        const blogResult = {
            blogId,
            translations: {}
        };
        
        for (const targetLang of targetLanguages) {
            // 模拟翻译过程
            await new Promise(resolve => setTimeout(resolve, 50));
            
            blogResult.translations[targetLang] = {
                status: 'success',
                message: `翻译到 ${targetLang} 完成`,
                translatedAt: new Date().toISOString()
            };
        }
        
        results.push(blogResult);
    }
    
    return results;
};

// 获取翻译统计
router.get('/blog-translation/stats', authenticateToken, async (req, res) => {
    try {
        const stats = {
            totalBlogs: 156,
            translatedBlogs: 89,
            totalLanguages: SUPPORTED_LANGUAGES.length,
            activeLanguages: 8,
            translationRequests: 1247,
            successRate: 98.5,
            averageTranslationTime: 2.3,
            lastUpdated: new Date().toISOString()
        };
        
        res.json({
            success: true,
            data: stats
        });
    } catch (error) {
        console.error('获取翻译统计失败:', error);
        res.status(500).json({
            success: false,
            message: '获取翻译统计失败'
        });
    }
});

module.exports = router;